Hemodialysis system for controlling electric conduction and ultra-filtration by weighing

Abstract

The invention discloses a hemodialysis system for controlling electric conduction and ultra-filtration by weighing, and belongs to the field of medical instruments. The hemodialysis system mainly comprises an automatic dialysis fluid preparation mixing chamber, two sets of ultra-filtration control assemblies with the same structure, and a circuit controlled by a microcomputer. The hemodialysis system is characterized in that the dialysis fluid preparation mixing chamber consists of a fluid container, a stirrer, an electric conductivity sensor, a heater, a temperature sensor, a liquid level sensor and a weight sensor; and the two sets of ultra-filtration control assemblies with the same structure consist of fluid containers, metering pumps, weight sensors, electromagnetic valves and liquid air detectors vertically overlapped together. The dialysis fluid prepared by adopting a weighing mode has high electric conduction accuracy and stable electrolyte, is not easy to produce complications, has wide electric conduction adjustable range, and is convenient for personalized dialysis. The ultra-filtration is controlled by the weighing and the metering pumps, so the precision is high, and the safety and reliability of the treatment are improved. In the treatment time, the two sets of working assemblies with the same structure alternately work in cycles through a liquid conversion valve so as to implement continuous work.

Description

technical field [0001] The invention relates to a hemodialysis system that controls conductance and ultrafiltration by weighing, which is suitable for hemodialysis and ultrafiltration for treating acute renal failure, chronic renal failure, uremia and other diseases, and belongs to the field of medical equipment. technical background [0002] At present, all the conductance control parts of hemodialysis machines clinically used in the market are basically realized by using gear pumps and plunger metering pumps in a certain proportion. However, due to the influence of water pressure fluctuations, the prepared The conductivity of the dialysate drifts, even beyond the range of clinically predetermined values, which can easily cause complications in patients, such as nausea, vomiting and other electrolyte disturbances, which increases the risk for patients and increases the workload of clinical treatment for medical staff; on the market The ultrafiltration control system of the ...

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Problems solved by technology

[0002] At present, all the conductance control parts of hemodialysis machines clinically used in the market are basically realized by using gear pumps and plunger metering pumps in a certain proportion. However, due to the influence of water pressure fluctuations, the prepared The conductivity of the dialysate drifts, even beyond the range of clinically predetermined values, which can easily cause complications in patients, such as nausea, vomiting and other electrolyte disturbances, which increases the risk for patients and increases the workload of clinical treatment for medical staff; on the market The ultrafiltration control system of the hemodialysis machine used has different control methods depending on the model. Various methods are used, such as flow meter control, balance chamber control, and silicone oil chamber control, and the flow meter is easily blocked by large particles. , the ultrafiltration accuracy is difficult to guarantee, the machine is prone to failure, and the performance is unstable; the hemodialysis machine adopting balance chamber and silicon oil chamber technology to control ultrafiltration, whether domestic or foreign, is very advanced, but its structure is very complicated and maintenance is relatively difficult , this is because the membrane material used in the balance chamber and the silicone oil chamber is extremely special, and after a long time of acid-base and high-temperature disinfection treatment, the membrane quality is easy to age, harden and become brittle, resulting in a large deviation in ultrafiltration. Even rupture, resulting in unstable quality of the inner membrane of the balance chamber, causing the hemodialysis machine to fail easily, affecting the reliability of the machine, and the cost of replacing the balance chamber is very expensive, so the price of this type of machine is high, and it is difficult for small and medium-sized hospitals to accept and apply

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